JPS6240098B2 - - Google Patents
Info
- Publication number
- JPS6240098B2 JPS6240098B2 JP5606181A JP5606181A JPS6240098B2 JP S6240098 B2 JPS6240098 B2 JP S6240098B2 JP 5606181 A JP5606181 A JP 5606181A JP 5606181 A JP5606181 A JP 5606181A JP S6240098 B2 JPS6240098 B2 JP S6240098B2
- Authority
- JP
- Japan
- Prior art keywords
- sand
- recovered sand
- amount
- water
- cooling device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000004576 sand Substances 0.000 claims description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 238000001816 cooling Methods 0.000 claims description 40
- 238000003756 stirring Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000032258 transport Effects 0.000 description 4
- 238000013019 agitation Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
本発明は注湯後、型ばらしして得た回収砂を、
鋳型を造型できる鋳物砂に再生するための回収砂
の水分コントロール方法に関する。
一般に鋳物砂は、温度が気温程度に維持される
とともに所定量の水分を含有してなければならな
い。従つて、鋳物砂を循環使用している造型ライ
ンにおいては、型ばらしで得られた回収砂は溶湯
で加熱されて高温で含水量の不足した状態になつ
ているため、回収砂に水分を適宜添加するととも
に撹拌式の冷却装置で冷却されている。そして、
この回収砂への水分の添加は、冷却装置に投入さ
れる前のコンベヤ上に回収砂の温度を測定し、そ
の測定値に対応した量の水分を添加することによ
つて行われている。
ところで、回収砂の温度は鋳込製品の重量や形
状、回収砂が冷却装置に投入されるまでの冷却時
間の変化により大きく変動し、しかも、回収砂は
冷却装置で水分の気化熱によつて冷却されるよう
になつているが、回収砂の温度が高い程その含水
量が少ないため温度の高い回収砂ほど冷却しにく
く、かつ回収砂の冷却によつてその水分が蒸発し
てその含水量がさらに少なくなつて水分変動がさ
らに激しくなり、その結果、冷却装置から排出さ
れる回収砂の温度や含水量は目標値から大きく外
れるなどの問題があつた。
本発明は上記の問題を解消するためになされた
もので、以下、本発明の一実施例について図面に
基づき詳細に説明する。
１は型ばらしにより生じる回収砂を搬送する搬
送コンベヤで、該搬送コンベヤ１の搬送終端下方
には、回収砂を撹拌しながら冷風を送つて水分を
蒸発せしめてその気化熱により回収砂を冷却する
撹拌冷却装置２の砂投入口が配置され、該撹拌冷
却装置２の砂排出口の下方には回収砂を図示され
ない混練装置へ搬送する搬送コンベヤ３が配設さ
れている。４は搬送コンベヤ１上の回収砂の量を
自動的に検出する砂量検出器で、該砂量検出器４
は制御盤５を介して自動水圧調整弁６に接続され
ており、該調整弁６の一端は水源７に連通接続さ
れていて、水源７からの水の圧力は、調整弁６を
もつて搬送コンベヤ１上の砂量に応じたものに増
減されるようになつている。また、自動水圧調整
弁６の他端は配管８、分岐管９を介して自動水量
調整弁１０，１１の夫々の一端に接続されてお
り、水量調整弁１０，１１の他端は搬送コンベヤ
１に臨ませた加水ノズル１２に配管１３，１４を
介して連通接続されている。１５は搬送コンベヤ
１上の回収砂の水分量を測定する水分測定器で、
該水分測定器１５は制御盤１６を介して自動水量
調整弁１０に接続されていて、回収砂の水分量が
目標水分量より少ない場合には、制御盤１６から
の信号を受けて自動水量調整弁１０が調整され、
その偏差値に相当した水分量が加水ノズル１２か
ら放出されるようになつている。１７は搬送コン
ベヤ１上の回収砂の温度を検出する砂温検出器、
１８は搬送コンベヤ３上の冷却済回収砂の温度を
検出する砂温検出器で、これらの砂温検出器１
７，１８は制御盤１９を介して自動水量調整弁１
１に接続されており、該制御盤１９は、砂温検出
器１７，１８からの信号によつて、冷却装置２に
よる回収砂の冷却度合を自動的に演算する機能を
備えている。
このように構成されたものは、型ばらしで生じ
た回収砂が搬送コンベヤ１により搬送されてくる
と、砂量検出器４がその回収砂の層の厚さを測定
して制御盤５に発信し、受信した制御盤５は予め
設定してある砂量と水圧との相関関係に従い、水
源７からの水の圧力が所定の高さになるように自
動水圧調整弁６に指令を発して該水圧調整弁６を
作動せしめ、そして、水分測定器１５が前記搬送
コンベヤ１上の回収砂の水分を測定して制御盤１
６に発信し、受信した制御盤１６は予め設定して
ある目標水分量と水分測定器１５による実質水分
量との偏差値に相当する水分量を自動水量調整弁
１０が流すことができるように自動水量調整弁１
０に指命を発し、これにより自動水量調整弁１０
が作動され、搬送コンベヤ１上の回収砂には加水
ノズル１２から所定量の水が散布される。
また、搬送コンベヤ１上の回収砂は撹拌冷却装
置２に投入されて冷却せしめられ、その後、搬送
コンベヤ３により後工程の混練工程に送られる。
そして、砂温検出器１７が撹拌冷却装置２で冷却
される前の回収砂の温度を、砂温検出器１８が撹
拌冷却装置２で冷却された後の回収砂の温度をそ
れぞれ測定して制御盤１９に発信する。この場
合、砂温検出器１７で測定された回収砂が、冷却
された後に砂温検出器１８で測定されるのではな
いが、回収砂が連続して流れているときは、砂温
検出器１７で測定された回収砂が冷却された後に
砂温検出器１８で測定されるとみなしても問題は
ない。こうして、砂温検出器１７，１８から受信
した制御盤１９は、砂温検出器１７，１８からの
測定値を相互比較して回収砂の冷却温度差を算出
し、続いて、砂の冷却温度差とこの冷却温度差に
対応する砂の蒸発水分量との相関関係に基づき予
め設定されている設定値と、前記の回収砂の冷却
温度差と、から回収砂が撹拌冷却装置２で蒸発せ
しめられた水分量を演算して自動流量調整弁１１
に指令を発し、これにより自動流量調整弁１１が
作動され、搬送コンベヤ１上の回収砂には加水ノ
ズル１２から撹拌冷却装置２で蒸発せしめられた
水分量が添加される。
なお、冷却温度差△Ｔと、蒸発水分量ａとの関
係は次式によつて近似的に示されるため、蒸発水
分量を算出できる。
ａ＝△Ｔ１／△Ｔ０
ただし、ａ：蒸発水分量（％）、△T0：冷却装
置の性能に基づく値（25〜35℃）、△T1：冷却温
度差（℃）
次に、本発明の方法を使用して撹拌冷却装置２
から排出される回収砂の水分を1.6％に制御する
場合と、従来の方法のように撹拌冷却装置２に投
入される前の回収砂について温度と量とを検出し
て冷却装置から排出される回収砂の水分が平均
1.6％になるように水分を添加する場合との比較
例を下表に示す。
The present invention uses recovered sand obtained by breaking the mold after pouring,
The present invention relates to a method for controlling the moisture content of recovered sand for recycling it into foundry sand that can be used to make molds. Generally, foundry sand must be maintained at a temperature similar to that of ambient air and must contain a predetermined amount of moisture. Therefore, in a molding line that recycles foundry sand, the recovered sand obtained from demolding is heated with molten metal and has a high temperature and lacks moisture content, so it is necessary to add moisture to the recovered sand as appropriate. As the mixture is added, it is cooled using a stirring type cooling device. and,
Moisture is added to the recovered sand by measuring the temperature of the recovered sand on the conveyor before being introduced into the cooling device, and adding an amount of moisture corresponding to the measured value. By the way, the temperature of the recovered sand varies greatly depending on the weight and shape of the cast product and the cooling time until the recovered sand is put into the cooling device. However, the higher the temperature of recovered sand, the lower its water content, so the higher the temperature of recovered sand, the more difficult it is to cool it. As a result, the temperature and water content of the recovered sand discharged from the cooling device deviated greatly from the target values, which caused problems. The present invention has been made to solve the above problems, and one embodiment of the present invention will be described in detail below with reference to the drawings. Reference numeral 1 denotes a transport conveyor that transports recovered sand generated by demolding, and below the conveyance end of the conveyor 1, cold air is sent while stirring the recovered sand to evaporate moisture and cool the recovered sand by the heat of vaporization. A sand inlet of the stirring cooling device 2 is arranged, and a conveyor 3 is arranged below the sand outlet of the stirring cooling device 2 for conveying the recovered sand to a kneading device (not shown). 4 is a sand amount detector that automatically detects the amount of recovered sand on the conveyor 1;
is connected to an automatic water pressure regulating valve 6 via a control panel 5, one end of which is connected to a water source 7, and the water pressure from the water source 7 is conveyed through the regulating valve 6. The amount is increased or decreased depending on the amount of sand on the conveyor 1. Further, the other end of the automatic water pressure regulating valve 6 is connected to one end of each of the automatic water quantity regulating valves 10 and 11 via a pipe 8 and a branch pipe 9, and the other end of the water quantity regulating valve 10 and 11 is connected to the conveyor 1 The water supply nozzle 12 is connected through piping 13 and 14 to a water nozzle 12 facing the water supply nozzle 12 . 15 is a moisture measuring device for measuring the moisture content of the recovered sand on the conveyor 1;
The moisture measuring device 15 is connected to an automatic water volume adjustment valve 10 via a control panel 16, and when the moisture content of the recovered sand is less than the target moisture content, it receives a signal from the control panel 16 and automatically adjusts the water volume. valve 10 is adjusted;
The water amount corresponding to the deviation value is discharged from the water adding nozzle 12. 17 is a sand temperature detector that detects the temperature of the recovered sand on the conveyor 1;
18 is a sand temperature detector for detecting the temperature of the cooled recovered sand on the conveyor 3;
7 and 18 are automatic water flow adjustment valves 1 via the control panel 19.
1, and the control panel 19 has a function of automatically calculating the degree of cooling of the recovered sand by the cooling device 2 based on the signals from the sand temperature detectors 17 and 18. With this configuration, when the recovered sand generated by demolding is conveyed by the conveyor 1, the sand amount detector 4 measures the thickness of the layer of the recovered sand and sends a message to the control panel 5. Then, the control panel 5 receives the command and issues a command to the automatic water pressure adjustment valve 6 so that the pressure of the water from the water source 7 reaches a predetermined level according to the preset correlation between the amount of sand and water pressure. The water pressure regulating valve 6 is activated, and the moisture measuring device 15 measures the moisture content of the recovered sand on the conveyor 1.
6, and the control panel 16 receives the message so that the automatic water amount adjustment valve 10 can flow the water amount corresponding to the deviation value between the preset target water amount and the actual water amount measured by the water measuring device 15. Automatic water flow adjustment valve 1
0, and this causes the automatic water flow adjustment valve 10 to
is activated, and a predetermined amount of water is sprayed onto the recovered sand on the conveyor 1 from the water nozzle 12. Further, the recovered sand on the transport conveyor 1 is put into the stirring cooling device 2 to be cooled, and then sent to the subsequent kneading process by the transport conveyor 3.
Then, the sand temperature detector 17 measures and controls the temperature of the recovered sand before it is cooled by the stirring cooling device 2, and the sand temperature detector 18 measures the temperature of the recovered sand after being cooled by the stirring cooling device 2. Send to board 19. In this case, the recovered sand measured by the sand temperature detector 17 is not measured by the sand temperature detector 18 after being cooled, but when the recovered sand is flowing continuously, the sand temperature detector There is no problem even if it is assumed that the recovered sand measured in step 17 is measured by the sand temperature detector 18 after being cooled. In this way, the control panel 19 that receives the data from the sand temperature detectors 17 and 18 mutually compares the measured values from the sand temperature detectors 17 and 18 to calculate the cooling temperature difference of the recovered sand, and then calculates the cooling temperature difference of the sand. The recovered sand is evaporated in the stirring cooling device 2 based on the set value that is preset based on the correlation between the difference and the evaporated water content of the sand corresponding to this cooling temperature difference, and the above-mentioned cooling temperature difference of the recovered sand. Automatic flow adjustment valve 11
A command is issued to operate the automatic flow rate adjustment valve 11, and the amount of water evaporated by the stirring cooling device 2 is added to the recovered sand on the conveyor 1 through the water addition nozzle 12. Note that the relationship between the cooling temperature difference ΔT and the amount of evaporated water a is approximately expressed by the following equation, so that the amount of evaporated water can be calculated. a=△T 1 /△T 0 However, a: Evaporated water content (%), △T 0 : Value based on cooling device performance (25 to 35°C), △T 1 : Cooling temperature difference (°C) Next , stirring cooling device 2 using the method of the invention
In the case of controlling the moisture content of the recovered sand discharged from the cooling device to 1.6%, and in the case of controlling the moisture content of the recovered sand to 1.6%, as in the conventional method, the temperature and amount of the recovered sand are detected before being put into the stirring cooling device 2 and the recovered sand is discharged from the cooling device. Average moisture content of recovered sand
A comparative example with the case where water is added to make it 1.6% is shown in the table below.
【表】
なお、上記の試験は気温が22℃で回収砂の量が
一定の条件下で行つた。また、上表中変動分以外
の数値は平均値で、変動分は標準偏差値でそれぞ
れ表わした。また、造型する場合の鋳物砂の水分
変動は造型性能上、±0.2％以内に管理する必要が
あるが、従来技術の場合は、撹拌冷却装置から排
出される回収砂の水分変動が上表から明らかなよ
うに0.6％であり、混練装置における水分制御が
如何に困難であるかが理解できる。
なお、上記実施例では、自動水量調整弁１０，
１１を使用しているが、これの代りに自動開閉弁
を使用してもよく、この場合、開閉弁は並列に接
続させて段階的に開閉される。
以上の説明からも明らかなように本発明は、撹
拌冷却装置に投入される前の回収砂の水分量から
算出した偏差水分量と、回収砂の冷却温度差から
算出した撹拌冷却装置での蒸発水分量とを、撹拌
冷却装置に投入される前の他の回収砂に添加する
ようにしたから、必要な水分量を回収砂に精度良
く添加することができるため、その後に回収砂を
鋳物砂に再生する場合に添加水分量の制御が非常
に簡単かつ容易になり、しかも、撹拌冷却装置に
投入される前の回収砂に適確な量の水分を添加で
きるため、撹拌冷却装置において回収砂を所定の
温度に容易かつ確実に冷却することが可能になる
などの優れた効果を奏する。[Table] The above test was conducted under conditions where the temperature was 22°C and the amount of recovered sand was constant. In addition, the values other than the fluctuations in the table above are expressed as average values, and the fluctuations are expressed as standard deviation values. In addition, moisture fluctuations in foundry sand during molding must be controlled within ±0.2% for molding performance, but in the case of conventional technology, moisture fluctuations in the recovered sand discharged from the stirring cooling device are as shown in the table above. As is clear, it is 0.6%, and it can be understood how difficult it is to control the moisture content in the kneading device. In addition, in the above embodiment, the automatic water amount adjustment valve 10,
11 is used, but automatic on-off valves may be used instead. In this case, the on-off valves are connected in parallel and opened and closed in stages. As is clear from the above explanation, the present invention is based on the deviation moisture content calculated from the moisture content of the recovered sand before being introduced into the agitation cooling device and the evaporation rate in the agitation cooling device calculated from the difference in the cooling temperature of the recovered sand. Since the amount of moisture is added to other recovered sand before it is put into the stirring cooling device, the required amount of moisture can be added to the recovered sand with high precision. It is very simple and easy to control the amount of water added when regenerating sand, and since it is possible to add an appropriate amount of water to the recovered sand before it is fed into the agitation cooling device, the amount of water added can be easily controlled. This provides excellent effects such as making it possible to easily and reliably cool down to a predetermined temperature.
図面は本発明の方法を実施するための装置の一
実施例の正面図である。
１…搬送コンベヤ、２…冷却装置、３…搬送コ
ンベヤ、１２…加水ノズル、１５…水分測定器、
１７，１８…砂温検出器。
The drawing is a front view of an embodiment of a device for carrying out the method of the invention. DESCRIPTION OF SYMBOLS 1...Transportation conveyor, 2...Cooling device, 3...Transportation conveyor, 12...Hydration nozzle, 15...Moisture measuring device,
17, 18...Sand temperature detector.
Claims (1)
を砂量検出器４により測定して自動水圧調整弁６
の圧力を前記砂量に対応した高さに調整し、前記
撹拌冷却装置２に投入される前に回収砂の水分量
を水分測定器１５により測定し、当該実質水分量
と目標水分量とから偏差水分量を算出し、前記撹
拌冷却装置２に投入される前の回収砂の温度およ
び該撹拌冷却装置２から排出された後の回収砂の
温度をそれぞれ測定して回収砂の冷却温度差を算
出し、当該冷却温度差から前記撹拌冷却装置２で
の蒸発水分量を演算し、前記自動水圧調整弁６の
下流側に連通接続された加水ノズル１２から、前
記砂量に対応する水分量を含む前記偏差水分量お
よび前記蒸発水分量を、前記撹拌冷却装置２に投
入される前の後続する回収砂に添加することを特
徴とする回収砂の水分コントロール方法。1 The amount of recovered sand before being put into the stirring cooling device 2 is measured by the sand amount detector 4 and the automatic water pressure adjustment valve 6 is
The pressure of the recovered sand is adjusted to a height corresponding to the amount of sand, and the moisture content of the recovered sand is measured by the moisture measuring device 15 before being introduced into the stirring cooling device 2, and the water content is calculated from the actual moisture content and the target moisture content. Calculate the deviation moisture content, measure the temperature of the recovered sand before it is introduced into the stirring cooling device 2 and the temperature of the recovered sand after being discharged from the stirring cooling device 2, and find the difference in the cooling temperature of the recovered sand. The amount of water evaporated in the stirring cooling device 2 is calculated from the cooling temperature difference, and the amount of water corresponding to the amount of sand is calculated from the water nozzle 12 connected to the downstream side of the automatic water pressure adjustment valve 6. A method for controlling the moisture content of recovered sand, characterized in that the deviation moisture content and the evaporated moisture content are added to the subsequent recovered sand before being input into the stirring cooling device 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5606181A JPS57171541A (en) | 1981-04-13 | 1981-04-13 | Treatment of recovered sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5606181A JPS57171541A (en) | 1981-04-13 | 1981-04-13 | Treatment of recovered sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57171541A JPS57171541A (en) | 1982-10-22 |
| JPS6240098B2 true JPS6240098B2 (en) | 1987-08-26 |
Family
ID=13016560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5606181A Granted JPS57171541A (en) | 1981-04-13 | 1981-04-13 | Treatment of recovered sand |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57171541A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60126246U (en) * | 1984-01-27 | 1985-08-24 | マツダ株式会社 | Molding sand moisture control device |
| JP6380849B2 (en) * | 2015-06-11 | 2018-08-29 | 新東工業株式会社 | Casting sand processing equipment and processing method |
-
1981
- 1981-04-13 JP JP5606181A patent/JPS57171541A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57171541A (en) | 1982-10-22 |
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